插件安装方法：
1. 在WordPress后台的插件部分，搜索 Multiple Post Thumbnails 在线安装或者，上传到服务器空间。
2. 激活插件。
1. 注册新的特色图片，切换到主题目录，打开functions.PHP文件，加入以下代码：
Crayon-5c891ce3a8a65466033165" class="Crayon-Syntax Crayon-theme-classic Crayon-font-monaco Crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouSEOver" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
Crayon-toolbar" data-settings=" mouSEOver overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">Crayon-title">functions.PHP
Crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
Crayon-button Crayon-nums-button" title="Toggle Line Numbers">
Crayon-button-icon">
Crayon-button Crayon-plain-button" title="Toggle Plain Code">
Crayon-button-icon">
Crayon-button Crayon-wrap-button" title="Toggle Line Wrap">
Crayon-button-icon">
Crayon-button Crayon-expand-button" title="Expand Code">
Crayon-button-icon">
Crayon-button Crayon-copy-button" title="Copy">
Crayon-button-icon">
Crayon-button Crayon-popup-button" title="Open Code In New Window">
Crayon-language">PHPCrayon-button-icon">
Crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
Crayon-plain-wrap">
Crayon-main" style="">Crayon-table">
| Crayon-nums " data-settings="show"> Crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> Crayon-code">Crayon-num" data-line="Crayon-5c891ce3a8a65466033165-1">1 Crayon-num" data-line="Crayon-5c891ce3a8a65466033165-3">3 Crayon-num" data-line="Crayon-5c891ce3a8a65466033165-5">5 Crayon-num" data-line="Crayon-5c891ce3a8a65466033165-7">7 Crayon-num" data-line="Crayon-5c891ce3a8a65466033165-9">9 Crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> Crayon-line" id="Crayon-5c891ce3a8a65466033165-1">Crayon-st">ifCrayon-h"> Crayon-sy">(Crayon-e">class_existsCrayon-sy">(Crayon-s">'MultiPostThumbnails'Crayon-sy">)Crayon-sy">)Crayon-h"> Crayon-sy">{ Crayon-line Crayon-striped-line" id="Crayon-5c891ce3a8a65466033165-2">Crayon-h">Crayon-r">newCrayon-h"> Crayon-e">MultiPostThumbnailsCrayon-sy">( Crayon-line Crayon-striped-line" id="Crayon-5c891ce3a8a65466033165-4">Crayon-h">Crayon-s">'label'Crayon-h"> Crayon-o">=Crayon-h"> Crayon-s">'Secondary Image'Crayon-sy">, Crayon-line" id="Crayon-5c891ce3a8a65466033165-5">Crayon-h">Crayon-s">'id'Crayon-h"> Crayon-o">=Crayon-h"> Crayon-s">'secondary-image'Crayon-sy">, Crayon-line Crayon-striped-line" id="Crayon-5c891ce3a8a65466033165-6">Crayon-h">Crayon-s">'post_type'Crayon-h"> Crayon-o">=Crayon-h"> Crayon-s">'post' Crayon-line Crayon-striped-line" id="Crayon-5c891ce3a8a65466033165-8">Crayon-h">Crayon-sy">)Crayon-sy">; Crayon-line" id="Crayon-5c891ce3a8a65466033165-9">Crayon-sy">} 注意：你可以通过将 post_type 设置为 page，给静态页面设置第二张特色图片（缩略图），或者给自定义日志类型设置多张缩略图。 2. 在文章日志页面通过如下代码显示刚才注册的新的特色图片： Crayon-5c891ce3a8a6f613418194" class="Crayon-Syntax Crayon-theme-classic Crayon-font-monaco Crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouSEOver" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> Crayon-toolbar" data-settings=" mouSEOver overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">Crayon-title">single.PHP Crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">Crayon-mixed-highlight" title="Contains Mixed Languages"> Crayon-button Crayon-nums-button" title="Toggle Line Numbers"> Crayon-button-icon"> Crayon-button Crayon-plain-button" title="Toggle Plain Code"> Crayon-button-icon"> Crayon-button Crayon-wrap-button" title="Toggle Line Wrap"> Crayon-button-icon"> Crayon-button Crayon-expand-button" title="Expand Code"> Crayon-button-icon"> Crayon-button Crayon-copy-button" title="Copy"> Crayon-button-icon"> Crayon-button Crayon-popup-button" title="Open Code In New Window"> Crayon-button-icon"> Crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"> Crayon-plain-wrap"> Crayon-main" style="">
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